Results 21 to 30 of about 1,774,538 (199)

Study on the damage law of coal rock affected by different alternating periods of cold and heat

Meitan kexue jishu, 2023
Temperature is an important factor affecting the physical properties of coal and rock, and as a solid medium, coal and rock have the properties of thermal expansion and contraction.
Hewan LI, Siyang SUN, Laigui WANG, Jian LIU, Ziheng ZHANG   +4 more
doaj   +1 more source

Study on the effect of moisture on mechanical properties and impact energy index of coal

Meikuang Anquan, 2023
Coal destruction is an energy-driven destabilization phenomenon. In order to investigate the effect of moisture on energy accumulation and dissipation during coal destruction, uniaxial compression tests on coal samples with different water content states
ZHANG Junjie, YUAN Xinli, ZHANG Hanqiao, CHEN Yi, HAN Guoqing, NIAN Guoxing
doaj   +1 more source

Study on coal damage and pore-fracture evolution ahead of the mining face under the disturbance of coal mining

Meitan xuebao
Abundant coal and coalbed methane resources are endowed in the vast basins of China. Mining disturbance alters the primary stress and fracture fields, thereby impacting the transportation and distribution of coalbed methane as well as gas extraction ...
Tong ZHANG, Zhizheng XIE, Liang YUAN, Ming TANG, Kaige ZHENG, Cun ZHANG, Junlin MAO   +6 more
doaj   +1 more source

A fractional order viscoelastic-plastic creep model for coal sample considering initial damage accumulation

Alexandria Engineering Journal, 2021
In deep coal and rock mass engineering, extensive initial damage problems caused by excavation and unloading are critical to the long-term deformation and stability of underground projects.
Peng Huang, Jixiong Zhang, Ntigurirwa Jean Damascene, Chaowei Dong, Zhaojun Wang   +4 more
doaj   +1 more source

Influence of Incremental Impact on the Damage of Coal-Rock under Unidirectional Constraint

Advances in Civil Engineering, 2019
Taking the briquette sample as research object, the influence of the incremental impulse (momentum) on the damage of coal-rock under different uniaxial axial pressure was studied by using the self-developed pendulum impact dynamic loading test device ...
Hongbao Zhao, Huan Zhang, Jinyu Li, Nansong Ju, Zhijie Wen   +4 more
doaj   +1 more source

Study on Evaluation and Prediction of the Degree of Surface Damage Caused by Coal Mining

Frontiers in Earth Science, 2022
Surface damage caused by coal mining is one of the problems perplexing ecological environment restorations in coal mining areas. Accurately evaluating and predicting the degree of surface damage induced by coal mining with reasonable and correct indexes ...
Xiaoshen Xie, Xiaoshen Xie, Enke Hou, Enke Hou, Tianwen Long, Tianwen Long, Dong Feng, Dong Feng, Pengfei Hou, Pengfei Hou, Qiming Wei, Yang Li, Jiangbin Liu   +12 more
doaj   +1 more source

Experimental study on deformation and acoustic emission characteristics of low-temperature frozen raw coal under uniaxial compression

Meikuang Anquan, 2021
Uniaxial compression was performed on frozen and untreated frozen coal samples under natural and natural saturated conditions. The strength and deformation characteristics of coal samples were analyzed, and the AE characteristics and damage evolution ...
FAN Guowei, SHANG Junning
doaj   +1 more source

Research on coal body damage and fractal characteristics under repeated drying and saturated water conditions

Meikuang Anquan
In order to study the mechanical properties, damage mechanism, and fractal characteristics of coal under repeated drying saturated conditions, through theoretical analysis and laboratory experiments, repeated non-destructive soaking, ultrasonic velocity ...
Zhengping BAI, Ning WANG
doaj   +1 more source

A Novel Damage Model for Strata Layers and Coal Mass [PDF]

Energies, 2020
Coal burst occurrences are affected by a range of mining and geological factors. Excessive slipping between the strata layers may release a considerable amount of strain energy, which can be destructive. A competent strata is also more vulnerable to riveting a large amount of strain energy. If the stored energy in the rigid roof reaches a certain level,
Faham Tahmasebinia, Chengguo Zhang, Ismet Canbulat, Samad Sepasgozar, Serkan Saydam   +4 more
openaire   +2 more sources

Mechanisms underlying coal instability during coal and gas outbursts induced by deep mining

Meitian dizhi yu kantan
Objective The gradual depletion of shallow coal resources drives a shift to the mining of deep coal seams. However, the complex deep mining environment significantly increases the potential risks and severity of coal and gas outbursts.
Chaolin ZHANG, Yunfu LI, Zhonghui LI, Enyuan WANG, Shiji YANG, Jiawei CHEN, Meng WANG   +6 more
doaj   +1 more source